Editing RYB color model

{{Short description|Subtractive color model}}
{{redirect|RYB}}
[[File:Chromatography 1841 Field.png|thumb|An RYB color chart from [[George Field (chemist)|George Field]]'s 1841 ''Chromatography; or, A treatise on colours and pigments: and of their powers in painting'']]
[[File:Síntesis sustractiva de colores.png|thumb|Comparison between CMYK model and RYB model: ideal CMY (a), printed CMY (b), RYB approximation (c)]]
[[File:Franciscus Aguilonius color scheme.png|thumb|The 1613 RYB color scheme of Franciscus Aguilonius (Francisci Agvilonii), with primaries yellow (flavus), red (rubeus), and blue (caeruleus) arranged between white (albus) and black (niger), with orange (aureus), green (viridis), and purple (purpureus) as combinations of two primaries]]
[[File:Le Blon three-color printing.png|thumb|Le Blon's 1725 description of mixing red, yellow, and blue paints or printing inks]]
[[File:Merimee-Chromatic Scale.jpg|thumb|Chromatic Scale (Echelle Chromatique), J. F. L Mérimée (1830, 1839)]]

'''RYB''' (an abbreviation of '''red–yellow–blue''') is a [[subtractive color]] model used in art and applied design in which [[red]], [[yellow]], and [[blue]] pigments are considered [[primary color]]s.<ref>{{cite book |last1=Gage |first1=John |title=Colour and Culture : Practice and Meaning from Antiquity to Abstraction |date=1995 |publisher=Thames & Hudson |place=London |isbn=978-0500278185}}</ref> Under [[traditional color theory]], this set of primary colors was advocated by [[Moses Harris]], [[Michel Eugène Chevreul]], [[Johannes Itten]] and [[Josef Albers]], and applied by countless artists and designers. The RYB color model underpinned the color curriculum of the [[Bauhaus]], [[Ulm School of Design]] and numerous art and design schools that were influenced by the Bauhaus, including the [[IIT Institute of Design]] (founded as the New Bauhaus), [[Black Mountain College]], Design Department [[Yale University]], the Shillito Design School, Sydney, and [[Parsons School of Design]], New York.

In this context, the term ''[[primary color]]'' refers to three exemplar colors (red, yellow, and blue) as opposed to specific pigments. As illustrated, in the RYB color model, red, yellow, and blue are intermixed to create [[secondary color]] segments of orange, green, and purple. This set of primary colors emerged at a time when access to a large range of pigments was limited by availability and cost, and it encouraged artists and designers to explore the many diverse colors through mixing and intermixing a limited range of pigment colors. In art and design education, gray, red, yellow, and blue pigments were usually augmented with white and black pigments, enabling the creation of a larger gamut of colors and details including [[tints and shades]].

Although scientifically obsolete because it does not meet the definition of a complementary color in which a neutral or black color must be mixed,{{clarification needed|date=December 2024}} it is still a model used in artistic environments, causing confusion about primary and complementary colors. It can be considered an approximation of the [[CMYK color model|CMY color model]].

The RYB color model relates specifically to color in the form of paint and pigment application in art and design.<ref>{{cite book |last1=Gage |first1=John |title=Color and Meaning: Art, Science, and Symbolism |date=2000 |publisher=Thames & Hudson |place=London |isbn=978-0520226111}}</ref> Other common color models include the [[RGB color model|light model (RGB)]] and the paint, pigment and ink [[CMY color model]], which is much more accurate in terms of color gamut and intensity compared to the traditional RYB color model, the latter emerging in conjunction with the [[CMYK color model]] in the printing industry.

==History==
The first scholars to propose that there are three primary colors for painters were Scarmiglioni (1601), Savot (1609), de Boodt (1609) and Aguilonius (1613).<ref>{{cite journal |last1=Shapiro |first1=A.E. |title=Artists' colors and Newton's colors. |journal=Isis |date=1994 |volume=85 |issue=4 |pages=600–630|doi=10.1086/356979 |s2cid=143026899 }}</ref> From these, the most influential was the work of [[Franciscus Aguilonius]] (1567–1617), although he did not arrange the colors in a wheel.<ref>{{cite web |title=Franciscus Aguilonius |work=Colorsystem: <!--different spellings in original-->Colour order systems in art and science |url=http://www.colorsystem.com/?page_id=629&lang=en |archive-url=https://web.archive.org/web/20140213041900/http://www.colorsystem.com/?page_id=629&lang=en|archive-date=2014-02-13}}</ref>

[[Jacob Christoph Le Blon]] was the first to apply the RYB color model to printing, specifically [[mezzotint]] printing, and he used separate plates for each color: yellow, red and blue plus black to add shades and contrast. In 'Coloritto', Le Blon asserted that “the art of mixing colours…(in) painting can represent all visible objects with three colours: yellow, red and blue; for all colours can be composed of these three, which I call Primitive”. Le Blon added that red and yellow make orange; red and blue, make purple; and blue and yellow make green (Le Blon, 1725, p6).<ref>{{cite book |last1=Le Blon |first1=Jakob Christophe |title=Coloritto; or the Harmony of Colouring in Painting: Reduced to Mechanical Practice under Easy Precepts, and Infallible Rules; Together with some Colour'd Figures. |date= 1725 |url=https://archive.org/details/Colorittoharmon00LeBl |access-date=4 July 2020}}</ref><ref>{{cite journal |last1=Mortimer |first1=Cromwell |title=An Account of Mr. J. C. Le Blon's Principles of Printing, in Imitation of Painting, and of Weaving Tapestry, in the Same Manner as Brocades. |journal=Philosophical Transactions of the Royal Society of London |date=February 1731 |volume=37 |issue=419 |pages=101–107 |doi=10.1098/rstl.1731.0019 |s2cid=186212141 |url=https://royalsocietypublishing.org/doi/10.1098/rstl.1731.0019 |access-date=4 July 2020}}</ref>

In the 18th century, [[Moses Harris]] advocated that a multitude of colors can be created from three "primitive" colors – red, yellow, and blue.<ref>{{cite book |last1=Harris |first1=Moses |title=The Natural System of Colours |date=1766 |publisher=(Facsimile edition of 1963), New York: Whitney Library of Design}}</ref>

Mérimée referred to "three simple colours (yellow, red, and blue)" that can produce a large gamut of colors and details. "United in pairs, these three primitive colours give birth to three other colours as distinct and brilliant as their originals; thus, yellow mixed with red, gives orange; red and blue, violet; and green is obtained by mixing blue and yellow" (Mérimée, 1839, p245). Mérimée illustrated these color relationships with a simple diagram located between pages 244 and 245: Chromatic Scale (Echelle Chromatique).''De la peinture à l’huile : ou, Des procédés matériels employés dans ce genre de peinture, depuis Hubert et Jean Van-Eyck jusqu’à nos jours'' was published in 1830 and an English translation by W. B. Sarsfield Taylor was published in London in 1839.<ref>{{cite book |last1=Mérimée |first1=J.F.L. |title=The art of painting in oil and in fresco: Being a history of the various processes and materials employed (translated from the French by W. B. Sarsfield Taylor |url=https://archive.org/details/artpaintinginoi01taylgoog/page/n8/mode/2up |publisher=Whittaker & Co. |location=London |date=1839}}</ref>

Similar ideas about the creation of color using red, yellow, and blue were discussed in ''[[Theory of Colours]]'' (1810) by the German poet, color theorist and government minister [[Johann Wolfgang von Goethe]].<ref>Goethe, ''Theory of Colours'', trans. Charles Lock Eastlake, Cambridge, MA: MIT Press, 1982. {{ISBN|0-262-57021-1}}</ref>

In ''The Law of Simultaneous Color Contrast'' (1839) by the French industrial chemist [[Michel Eugène Chevreul]] discussed the creation of numerous color nuances and his color theories were underpinned by the RYB color model.<ref>{{cite book | author = Chevreul, Michel Eugène | title = The Laws of Contrast of Colour | year = 1861 | publisher = Routledge, Warne, and Routledge | place = London | url = https://archive.org/details/lawscontrastcol00chevgoog| page = [https://archive.org/details/lawscontrastcol00chevgoog/page/n70 25] }} – English translation by John Spanton</ref>

Separate to the RYB color model, cyan, magenta, and yellow primary colors are associated with [[CMYK color model|CMYK]] commonly used in the printing industry. Cyan, magenta, and yellow are often referred to as "process blue", "process red", and "process yellow".<ref>{{cite journal |last1=St. John |first1=Eugene |title=Some Practical Hints on Presswork |journal=Inland Printer, American Lithographer |date=February 1924 |volume=72 |issue=5 |page=805 |url=https://books.google.com/books?id=nxUhAQAAMAAJ&pg=PA805 |access-date=18 February 2019}}</ref><ref>{{cite book |last1=White |first1=Jan |title=Editing by Design: For Designers, Art Directors, and Editors—the Classic Guide to Winning Readers |date=2003 |publisher=Simon and Schuster |isbn=9781581159387 |page=PT460 |url=https://books.google.com/books?id=NGqCDwAAQBAJ&pg=PT460 |access-date=18 February 2019}}</ref>

=== Old model of coloration with four primaries ===
The ancient Greeks, under the influence of [[Aristotle]], [[Democritus]] and [[Plato]], considered that there were four basic colors that coincided with the [[four elements]]: earth ([[ochre]]), sky (blue), water (green) and fire (red), while black and white represented the light of day and the darkness of night. {{Citation needed|reason=Seems counter to Artistotle's On Colors, Plato's Timaeus, etc.|date=April 2023}} The four-color system is formed by the primaries yellow, green, blue and red, and was supported by [[Leon Battista Alberti|Alberti]] in his "[[De pictura|De Pictura]]" (1436), using the rectangle, rhombus, and  [[color wheel]] to represent them.
[[File:Traité de la peinture, 1708.png|thumb|[[Color Circle]] from 1708, based on the primary colors blue, red, and yellow<ref>Traité de la peinture en mignature (The Hague, 1708), reproduced at [http://www.gutenberg-e.org/lowengard/A_Chap03.html The Creation of Color in Eighteenth-Century Europe]</ref>]]

[[Leonardo da Vinci]] endorsed this model in 1510, although he hesitated to include green, noting that green could be obtained by mixing blue and yellow. Also Richard Waller, in his "Catalogue of Simple and Mixed Colors" (1686), graphed these four colors in a square.<ref>[http://www.colorsystem.com/?page_id=676&lang=en Richard Waller] Color System</ref> These four colors have often been referred to as "the primary psychological colors".<ref>MS Sharon Ross, Elise Kinkead (2004). [http://www.benjaminmoore.com/en-us/for-your-home/faux-and-decorative-finishes Decorative Painting & Faux Finishes]. Creative Homeowner. ISBN 1-58011-179-3.</ref>

=== Traditional coloring with three primaries ===
The first known case of [[Trichromia|trichromacy]] coloration (of 3 primaries) can be found in a work on optics by the Belgian thinker [[Franciscus Aguilonius]] in 1613,<ref>[https://web.archive .org/web/20140213041900/http://www.colorsystem.com/?page_id=629&lang=en Franciscus Aguilonius] Colorsystem. Farbsysteme in Kunst und Wissenschaft</ref> who in his ''"Opticorum libri sex, philosophis iuxtà ac mathematicis utiles"'' in Latin (Roughly, ''Six books of optics: useful to philosophers as well as to mathematicians''), graphed the colors ''flavvus'', ''rvbevs'' and ''cærvlevs'' ([[yellow]], [[red]] and [[blue]]) giving rise to the intermediate colors ''avrevs'', ''viridis'' and ''pvrpvrevs'' ([[Orange (color)|orange]], [[green]] and [[purple]]) and their relationship with the extremes ''albvs'' and ''niger'' ([[white]] and [[Black (color)|black]]).<ref>Francisco de Aguilón, Antwerp 1613: [http://www.fsanmillan.es/biblioteca/francisco-de-aguilon-opticorum-libro-sex-philosophis-iuxta-ac-mathematicis-utiles Opticorum book sex, philosophis iuxta ac useful mathematics, p. 40] {{webarchive|url=https://web.archive.org/web/20150924015734/http://www.fsanmillan.es/biblioteca/francisco-de-aguilon-opticorum-libro-sex-philosophis-iuxta-ac-mathematicis-utils}} San Millán Foundation of the Cogolla p. 84</ref> However, the idea of three primary colors is older, as Aguilonius supported the view known since the Middle Ages that the colors yellow, red, and blue were the basic or "noble" colors from which all others are derived.<ref>{{cite web|title=Color vision: Do "primary" colors exist?|url=http://handprint.com/HP/WCL/color6.html#ancient|access-date=September 1, 2017|language =English|last=MacEvoy|first=Bruce|publisher=Handprint.com|year=2005}}</ref>

This model was used for printing by [[Jacob Christoph Le Blon]] in 1725 and called it ''Coloritto'' or ''harmony of colouring'',<ref>O. M. Lilien, Jacob Christoph Le Blon, 1667–1741: Inventor of Three- and Four-colour Printing. Stuttgart 1985</ref> stating that the primitive (primary) colors are yellow, red and blue, while the [[secondary colors|secondary]] are orange, green and purple or [[Violet (color)|violet]].<ref>{{Cite book|url=https://books.google.com/books?id=-fNJZ0xmTFIC&dq=%22le+blon%22+color+printing&pg=PA6|title=The Science of Color|first=Steven K.|last=Shevell|date=July 11, 2003|publisher=Elsevier|isbn=978-0-08-052322-4 |via=Google Books}}</ref>

In 1766, Moses Harris developed an 18-color color wheel based on this model, including a wider range of colors by adding light and dark derivatives.<ref>Paul Zelanski, Mary Pat Fisher 2001. "Colour" London</ref> During the 18th and 19th centuries, this color model was endorsed by many authors who have left illustrations that can still be appreciated today, such as Louis-Bertrand Castel (1740), the [[Mayer's color theory|Tobias's color system Mayer]] (1758), Moses Harris (1770–76), Ignaz Schiffermuller (1772), Baumgartner and Muller (1803), Sowerby (1809), Runge (1809), the popular "[[Theory of Colors]]" (1810) by [[Johann Wolfgang von Goethe|Goethe]], Gregoire (1810–20), Merimee (1815-30-39), Klotz (1816), G. Field (1817-41-50), Hayter (1826 ), the "Law of Simultaneous Contrast of Colours" (1839) by [[Michel Eugène Chevreul|Chevreul]] and many others.<ref>David Briggs 2013, The Dimensions of Color [http://www.huevaluechroma.com/072.php 7.2 The RYB hu e circle or "artists' color wheel".]</ref>
[[File:Moses_Harris,_Prismatic_Colour_Wheel,_1766.jpg|thumb|upright|Harris's '[[colour wheel]]' showing how a range of colours can be made from red, yellow and blue]]

By the 20th century, natural pigments gave way to synthetic ones. The invention of [[phthalocyanine]] and derivatives of [[quinacridone]], expanded the range of primary blues and reds, getting closer to the ideal subtractive colors and the [[CMY color model|CMY]] and [[CMYK]] models.
[[File:NIEdot367.jpg|thumb|Use in [[printing]] of color books in 1902 through the so-called "tricolor process"]]

==See also==

*[[Color]]
*[[Color solid]]
*[[Color theory]]
*[[List of colors]]
*[[Primary colors]]

==References==
{{reflist}}

==External links==
* [https://web.archive.org/web/20130628074235/http://www.paintassistant.com/rybrgb.html a web RYB to RGB converter]

{{Color space}}

{{DEFAULTSORT:Ryb Color Model}}
[[Category:Color space]]
[[Category:Obsolete scientific theories]]